Views: 5 Author: pqwt Publish Time: 2022-10-21 Origin: PQWT
This is a famous saying: "comparison is the only way to identify". The size of the value, high and low, how much, good and bad are relative, no big is not small, do not know the good of the bad can not see, "do not know the true face of Mount Lushan, only in this mountain", "in the blessing do not know the blessing", said this is the truth.
To compare there should be a reference, the correct choice of reference is very important. Resistivity bathymetry is customarily used to "measure the plate method", that is, first calculated a number of "theoretical curve", divided into A, K, H, Q four types of curve "plate", use it to go with the actual measurement of the The curves are compared with the measured ones. Due to the complexity of the measured curves, the practical value of the measurement plate method is not large. Tiandian method and other physical methods, need to follow the principle of known to unknown, if there is no available reference for comparison, no matter how to analyze is also a blind guess.
How to choose a reference for the ground water detector?
First, and the best way: to try to find a known well first to measure a ground water detector profile (you can point 5 meters away from the left, center and right to measure a total of five points). Since the ground water detector is closer to the unknown well, the stratigraphic structure, lithologic combination, electromagnetic environment, regional structure, and groundwater recharge conditions are more convergent and comparable. First, observe the performance of the known wells in the water outflow area in the map to see which type of geological anomaly it is and how obvious it is, and then compare the unknown profile with the known well profile, so that the comparison is better than using other cases of well formation from thousands of miles away. The comparison with known wells can not only be qualitative, but also roughly quantitative, which is the best teacher, and it is much better than asking people to "guess" in the group. Especially for the fracture-prone type of map where no anomaly can be seen, if you don't compare with known wells, it is easy to misjudge that there is no water. Imagine, where is the anomaly if there is water at any point of drilling? (We have sent several such cases.) The more water-rich area, the more we should compare known wells.
The next thing is: when there is no known well near the measurement area, use the ground water detector to measure several profiles, and compare the unknown line with the unknown line to see which line has more obvious anomalies and greater electrical differences in the lateral or vertical direction, and then compare them with cases of the same lithology in the field. If you use the ground water detector to measure only one line and then consult, whoever is helping you "guess", the risk of drilling a dry hole is much higher, and it is much less likely to find the best well in the measured area.
Then, retest your initial ground water detector line (if there is a suspicion of high and low values downstream, you must conduct a misalignment retest) and compare yourself with yourself, the purpose of the comparison is to see the reliability of the anomaly. If the anomaly changes when retesting, such anomaly is not reliable. If you only measure it once, and neither retest in place nor in situ, then send it to the group for consultation and ask everyone to guess it together, the more false anomalies there are in the poor water area, and if you lack the ability to "remove the false and keep the true", the less likely you will guess it right.
As long as the above work is done, the analysis of curve information will be targeted and well-founded.
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